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Digestive Histologyand Physiology
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SC.912.L.14.45 SC.912.L.14.46 What are the organs of the digestive system? How is food digested? Oral cavity with salivary glands esophagus pharynx stomach Large ... – PowerPoint PPT presentation
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Title: Digestive Histologyand Physiology
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Digestive Histologyand Physiology
- SC.912.L.14.45
- SC.912.L.14.46
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Essential Question
- What are the organs of the digestive system?
- How is food digested?
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Digestive system..organs
pharynx
Oral cavity with salivary glands
esophagus
Liver and gall bladder
stomach
pancreas
Small intestine
Large intestine
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Activities occurring in the Digestive System
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Control of Digestive activity
- Chemical and pressure receptors
- Hormones
- Autonomic nervous system
- Central nervous system
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Salivary glands
- Salivary amylase secreted..digestion of starch
and glycogen (polysaccharides)
parotid
submandibular
sublingual
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Esophagus
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Stomach
- Protein digestion begins here
- Secretions HCl and pepsinogen
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Control of HCl secretion
- Neural..parasympathetic
- Hormonal..gastrin
- Histamine
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Stomach Churning
3 ml. of chyme squirted out with each wave
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Small intestine
- Main function absorption.ileum main site
- Digestion of carbohydrates, fats and proteins
occurs here
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Bile and pancreatic juice
- Bile
- Emulsifies fats
- Facilitate cholesterol and fat absorption
- Keep cholesterol dissolved in bile
- Pancreatic juice
- Proteases..digest protein
- Amylases..digest carbohydrates
- Lipases..digest fats
- Bicarbonate ions..neutralize acidity
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Segmentation and peristalsis
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Absorption in Small Intestine
- Water, electrolytes and nutrients absorbed
- Active and passive transport mechanisms used
- Absorption in simplest forms
- Glucose and amino acids enter blood stream
- Fat enters lymphatic system
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Large intestine
- Main function absorption of water, and
elimination of feces - Production of Vitamin K and B complex
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Day 2
- Divide your paper into 8 Frames. Draw a cartoon
depicting the digestion of a hamburger.
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Day 3 - Continue
- Make a set of study cards with a partner. Put the
organ one side and the functions on the other.
Be sure you can recognize both sides.
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Day 4--- Fate of nutrients
- Where were they digested?
- How were they absorbed?
- Carbohydrates
- Proteins
- Lipids
- Water
